Defect-property correlations in garnet crystals. III. The electrical conductivity and defect structure of luminescent nickel-doped yttrium aluminum garnet

S. R. Rotman, H. L. Tuller

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The conduction mechanisms in nickel-doped yttrium aluminum garnet (Ni:YAG) have been studied as a function of temperature and partial pressue of oxygen. ac conductivity and ionic transference measurements show that Ni:YAG is a mixed ionic-electronic conductor with an ionic mobility characterized by an activation energy of 2.0-2.2 eV. The reduction of Ni+3 to Ni +2 causes an increase in the oxygen vacancy concentration and a concurrent rise in the magnitude of the ionic conductivity. Codoping with zirconium, on the other hand, fixes the nickel in the divalent state, increases the n-type conductivity, and lowers the degree of ionic conductivity. A defect model is presented which is consistent with all of these observations.

Original languageEnglish
Pages (from-to)1305-1312
Number of pages8
JournalJournal of Applied Physics
Volume62
Issue number4
DOIs
StatePublished - 1 Jan 1987
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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